Buffing stand



Jan. 3, 1950 P. E. HAWKINSON 2,493,289

BUFFING' STAND Filed Nov. 25, 1946 207972292 fax/Z E Haw/112721022 fi z/ fiZZP JifZ/WJ WM Patented Jan. 3, 1950 BUFFING STAND Paul E. Hawkinson, Minneapolis, Minn, assignor to Paul E. Hawkinson Company, Minneapolis, Minn, a corporation of Minnesota Application November 25, 1946, Serial No. 712,055

1 Claim.

My invention relates to tire bufiing or abrading machines and particularly to such machines constructed and arranged to buii or finish a pneumatic tire in connection with a treading operation.

The primary object of my invention is the provision of light, inexpensive, and easily mobile apparatus for mounting the tire for the buffing operation. 7 I v Another object of my invention is the provision of novel cooperating handle and braking mechanism, whereby the movements of the tire and the rotation ofthe same may be easily and quickly controlled by the operator.

The above and still further objects of my invention will become apparent from the follow ing detailed specification, appended claims, and attached drawings.

Referring to the drawings wherein like characters indicate like parts throughout the several views:

Fig. 1 is a perspective view of my novel device;

Fig. 2 is an enlarged fragmentary perspective View of my device with a pneumatic tire mounted thereon and also showing a conventional bufiing wheel; and

Fig. 3 is a view partly in section and partly in side elevation on the line 3-3 of Fig. 1, some parts being broken away.

Referring with greater particularity to the drawings, the numeral l indicates, in its entirety, a T-shaped base mounted on rollers or casters 2 to facilitate mobility. Upstanding from base i is a supporting post or pedestal 3 reinforced by an angular member 4. Members I, 3, and i may be formed in any suitable manner, but preferably. 1*

and as shown, are formed of conventional tubular pipe suitably joined, either by welding or by the use of standard fittings. At its extreme upper end, supporting post or pedestal 3 is provided with a pipe elbow 5 which is rigidly secured thereto. Projecting laterally from the post 3 and, as shown, made fast to the elbow 5 is a spindle (5 which is threaded at its outer end, as at l. The spindle t is non-rotatable and has secured thereto adjacent the elbow 5 a non-rotary brake element in form of a disk or plate 8. Mounted for rotation on the spindle 6 is an elongated tubular sleeve 9 to the inner end of which is secured for rotation therewith a rotary brake element in the form of a plate or disk l0. As shown brake lining ii is interposed between the brake elements 3 and it and may be secured to either thereof. Bearings I2 are interposed between the spindle e and the sleeve 9 adjacent the ends of the sleeve c. The spindle 6 projects axially beyond the end of the sleeve 9 and the sleeve is movedaxially ofthe spindle to provide operative engagement between the brake elements 8 and it by means of a handle forming screw cap it having threaded engagement with the projecting portion i of the spindle 5. A thrust being I i is interposedbetween the inner end of the cap [3 and the end of the sleeve 9 to prevent accidental rotation of cap l3 by sleeve 9. V

A work piece holder, in this instance, a tire supporting wheel, is made up of two opposed, identical cup-shaped elements I5. Elements I 5 have inwardly extending flanges l6 which are'clamped to a collar ll by means of an annular clamping nut 8. The collar ii is preferably keyed to the sleeve 9, as at I9.

One or both of the cup-shaped elements 15 are provided with an opening 20 to receive the air valve 2| of an inner tube pneumatic tire 22, which may be mounted thereon, as shown in Fig. 2. As there shown, the tire 22 is mounted upon the buffing stand for working engagement with bufiing or abrading wheel 23.

For easy and efiicient manipulation of the tire for positioning same against the buffing wheel, I provide a handle 24 which projects laterally outwardly from the elbow 5 in a direction opposite to that of the spindle 6 in approximately the same vertical and horizontal planes as handle l3.

To place a pneumatic tire on my novel bufiing stand or jig in the position indicated in Fig. 2, it is but necessary to apply a suitable spanner wrench to the spanner locking nut l8 to remove the same from the collar I! and off of the free end of sleeve 9 and spindle 6 over bearing l4 and screw handle l3. Thereafter, the wheel forming sections l5 may be removed in like manner. The wheel forming elements 15 may then be applied one to each side of a tube equipped pneumatic tire 22 to engage the beads thereof, and the valve 2| is placed through the aperture 20. The tire mounted wheel forming elements l5 are then slipped back unto the collar I! and the lock nut is replaced and tightened. The tire is now ready for buffing or abrading.

When the tire 22 is brought into bumng or abrading contact with the rasp surface of the bufiing wheel 23, braking action must be applied to the tire so that proper abrading action thereon is achieved. This brakin action is accomplished by the turning of the screw cap l3 upon the threaded portion 7 of the spindle 6 to force the brake elements 8, l0, and II into proper braking engagement. It may be here noted that the hands of the operator are placed one each upon the handle forming screw cap l3 and the handle 24 for the purpose of guiding the peripheral surface of the tire into proper working engagement with the rasp surface of the bufiing wheel 23, and braking action is applied to the tire by a very slight twisting action upon the screw cap l3. This twisting action is not sufficient to disturb the guiding action of the operator upon the tire in its relation to the bufiing wheel.

I have found this apparatus particularly adaptable for use in mounting and buffin of odd-sized, relatively light-weight airplane tires, industrial tires, and the like, wherein the overall diameters of the tires and the rim sizes thereof vary greatly and thus make it uneconomical to provide expensive bufiing stands or jigs therefor. My novel and inexpensive manner of forming wheel elements makes it possible to provide such wheel elements for any given size of tire at relatively small cost.

While I have disclosed a commercial form of my invention as required by Section 4888 of the United States Statutes, it should be clear that the same is subject to modification without departure from the scope of the appended claims.

What I claim is:

A tire support stand comprisin an upright pedestal, a disk shaped brake element non-rotatably secured to the upper end of the pedestal with the axis of the disk at right angles thereto, an elongated spindle secured to the center of said disk and extending therefrom in a line coaxial with the disk, said spindle being threaded at the extended end, a second disk shaped brake element parallel to and closely adjacent said first mentioned stationary disk, said second disk provided with an opening coaxial with the axis of the stationary disk, an elongated sleeve secured in the opening of said second disk extending away therefrom and surrounding said spindle for rotation with respect thereto, an annular tire holder keyed to and slidably mounted on the sleeve at a point intermediate the brake element and the outer spindle end, a hand nut threaded on the outer threaded end of the spindle, an antifriction thrust bearing on the spindle interposed between the hand nut and sleeve whereby rotation of the nut moves the sleeve and tire holder longitudinally on the spindle for engagement and disengagement of said brake elements.

PAUL E. HAWKINSON.

REFERENCES CITED The following reterences are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 911,412 Lang Feb. 2, 1909 1,051,533 Woodward Jan. 28, 1913 1,932,302 Browne Oct. 24, 1933 2,197,808 Mason Apr. 23, 1940 2,254,526 Hawkinson Sept. 2, 1941 2,366,685 Chambers Jan. 2, 1945 2,392,667 Hawkinson Jan. 8, 1946 

